dittbenner



Patented Aug. 9, I898.

H. G. DITTBENN ER. CUSHION STOP FOB-NIGGER BARS.

(Application filed Oct. 26, 1897.)

(No Model.)

IlNirnn STATES PATE T Prion.

HERMANN G. DITTBENNER, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO HENRY l'I. SMITH, OFSAME PLACE.

CUSHION-STOP FOR NlGGER-BARS.

SPECIFICATION forming part of Letters Patent No. 608,975, dated August 9, 1898.-

Application filed October 26,1897. Serial no. 656,411. (No model.)

To all whom it nmy ooncerm. 7

Be it known that I, HERMANN G.D1TTBEN- NER, of Minneapolis,- county of Hennepin, State of Minnesota, have invented certainnew and useful Improvements in Cushion Stopsfor Nigger-Bars, of which the following is a specification.

My invention relates to a yielding mechanism for receiving the blow of a steamniggerbar; and the object I have in view is to provide a device having a mechanism to be com-' pressed by the blow of the bar when it reaches the limit of its stroke in either direction, thereby doing away with the necessity of providing a cushion at each end of the travel of the bar; and a further object is to provide a frame or guide which can be adjusted forusewith bars of diiferent length and thickness.

A still further object is to provide a frame extremely simple in construction, and therefore cheap to manufacture, which can be placed directly beneath the lo -deck near the upper end of the bar and. in which the parts.

are interchangeable, so that the portions of the frame that are directly exposed to the blows of the bar and become worn or broken may be exchanged for other parts that occupy less-exposed positions, and thereby the life of the frame or cushion greatly increased.

My invention consists generally in theframe near the upper log-deck, said or guide secured, preferably, end of the bar beneath the frame being formed in two parts or sections between which the bar is adapted to operate and provided at one endwith a yielding mechu anism to be compressed by the blow of the bar at each end of its stroke, all as hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure l is a side elevation of a device embodying my invention, the floor of the mill and the log-deck being shown in section. Fig. 2.is a plan view of the same. Fig. 3 is a horizontal longitudinal section of a portion of the frame.

In the accompanying drawings,2 represents the floor of the mill; 3, the carriage; 4, the lo deck, and 5 the lograil, upon which the logs are rolled down into position to be operated upon by the nigger-bar.

Upon the floor ofthe mill, beneath the log deck, I arrange the timbers 7 uponeach side of'a slot or opening provided in saidfioor, through which projects the nigger-bar 10. Upon the upper surface of said timbers I arrange the frame of the cushion, comprising two heavy castings or fixedparts 6, firmly secured to said timbers and to thefioor of the mill by the long bolts 8,8, 9, and 9, These parts 6 and the timbers 7 form guides upon either side of the nigger-bar 10, which extends up between them to a point. just below the upper edge of the log-rail 5, as shown in Fig. 1. The nigger-bar is of the ordinary construction, having a roll at its upper end and teeth at intervals inits edge to engage the log when it is desired to roll it over orthrow it upon the carriage. The bar is free to move backward and forward and up and down between the guides during the operation of turning the l'og.

Each j guide 6 is provided with a broad flanged base resting upon the timbers 7 and with the inner and outer vertical walls 11 and 12. Thesewalls are preferably cast with the base and extend nearly the entire length of the same, as shown in Fig. 3. The forward end of said walls are beveled and a space is provided between them for the purpose hereinafter described, and the inner walls 12 are provided with vertical recesses to receive the bolts 8, 8, and 9, which pass down through the space between said vertical walls. The forward end ofthe guideo is provided with .the lateral projections 10 upon the upper and lower side of said guide, and the"p1ates13 are arranged. ineach guide between the upper and lower part 10, as shown in Fig.2. The outerends of the plates 13 are loosely secured to the guide 6 by bolts 16, passing through holes 14 in said plates, that are considerably larger .in diameter than the bolts 16. \Vith this construction the plate 13 when struck by the bar in its forward movement will be permitted to move forward to the position indi-' cated by dotted lines in Fig. 3. The inner ends of the plate 13 are provided with the holes 15, through which pass the bolts 17, that extend along between the walls 11 and 12 to the rear end of the guide and project some little distance beyond the same.

The bolts 17 fit movement of the plate 13 heretofore described. The inner ends of said plates project beyond the inner surface of the guide 6 into the path of the nigger-bar, a narrow space being provided between said ends to permit the teeth of said bar to pass between them. The edges of the lateral projections 10 project over said plates 13 and prevent sawdust and bark from interfering with the movement of the same. At the rear end of said guides I provide the plate 18, having the holes 19, through which pass the bolts 17, heretofore described. The bolts 17 fit loosely within said holes, and spiral springs 23 are arranged on said bolts, having one end bearing upon the outer surface of said plate 18 and the other upon the washers 20, provided on said bolts and held in place by the nuts 21 and 22.

The plates 13 may be adjusted longitudinally to permit the use of the device with nigger-bars of different thickness, and said plates are also interchangeable, so that when their inner ends become worn or broken they may be exchanged or their positions reversed and a new surface presented to the blow of the bar. If desired, the rear plate or stop 18 may also be made interchangeable with the forward stops.

I prefer to arrange the cushion directly be neath the log-deck, as shown in Fig. 1, where the greatest advantage may be derived from the use of the cushion stops. In cushionstops of the ordinary construction one of the cushions has to be placed beneath the rail of the track over which the carriage passes; but as I arrange both my cushions at one end of the device I am able to place the opposite end of the same flush with the forward edge of the log-deck and near the top of the niggerbar.

. The operation of the device is as follows: The guides being secured on either side of the bar will bring the plate 18 directly across the path of the bar at the limit of its backward stroke, while the forward edges of the plates 13 will be in position to engage the forward edge of the bar when it reaches the limit of its forward stroke. When the bar strikes the surface of the plate 18, the plate will be moved back over the bolts 17, compressing the springs 23, which will take up the blow of the bar and prevent damage to it and to the machinery operating the same. In striking the ends of the plates 13 at the limit of its forward movement the springs will be again compressed in the opposite direction and the force of the blow taken up, as before. The sawdust, bark, and other refuse matter that may be thrown against the forward stops by the bar will pass off to one side, being aided in passing through the device by the beveled end of the walls 11 and 1.2. The walls 11 and 12 also serve to protect the bolts 17 and cover the holes 15 and 19 to prevent the same from being filled up or the mechanism becoming clogged by the accumulation of bark or sawdust.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A cushion-stop for nigger-bars, comprising forward and rear stops between which the bar travels, and a single yielding device connected with said stops whereby said device is compressed by a blow of the bar when near the limit of its stroke in either direction, substantially as described.

2. A cushion-stop for nigger-bars, comprising forward and rear stops between which the bar travels, yielding mechanism provided at one end of the device and connected with said stops and whereby said mechanism is compressed by a blow of the bar when near the limit of its stroke in either direction, substantially as described.

3. A cushion-stop for nigger-bars, comprising the forward and rear stops, the yielding mechanism provided at one end of the device and adapted to be compressed by a blow of the bar when near the limit of its stroke in either direction, and said forward stops being interchangeable, for the purpose set forth.

4. In a device of the class described, the combination, with the fixed parts or guides, the rear stop connecting said guides, the forward stops, means connecting said forward and rear stops, and the yielding mechanism arranged to take up the force of the blow of the bar upon said stops at both the forward and backward limit of its stroke,substantially as described.

5. In a device of the class described, the combination, with the guides, of the forward and rear stops supported thereby and comprising the plates 13 and 18,the yielding mechanism arranged near said plate 18, means supporting said yielding mechanism and connecting said plates 13 and l8,and means for loosely connecting the outer ends of said plates to said guides, for the purpose set forth.

6. The combination, in a device of the class described, of the guides 6 having the longitudinal walls 11 and 12, and the lateral projections 10, the plates 13 forming the forward stops, means for loosely securing the outer ends of the same to said guides, the rear stop connecting said guides, the bolts 17, the springs carried thereby, and the holes in said plates 13 to receive said bolts, being considerably larger than the diameter of the same, substantially as described.

7. In a device of the class described, the combination, with the guides, having the parallel walls 11 and 12, the stops arranged at the opposite ends of said walls, the bolts connecting said stops, and passing between said walls, the springs carried by said bolts, and arranged to bear upon the outer surface of said rear stop, and means for securing said springs upon said bolts, substantially as de scribed.

8. The combination, in a device of the class described, of the guides 6, havingthe walls 11 and 12, the plates 13 and 18 forming the forward and rear stops, the bolts connectingthe same, the yielding mechanism carried thereby, the projections 10,forming guides for said 1 plates 13, and the forward ends of said walls 11 and 12, being forth.

9. A cushion-stop for nigger-bars, comprising adjustable forward stops beveled, for the purpose set the path of the bar, a rear stop between which projecting into and said forward stops the bar travels, yielding mechanism connected with said stops to be compressed by a blow of said bar upon the rear stop and to be similarly compressed in the opposite direction by a blow upon said forward stops, substantially as described.

In testimonywhereof I have hereunto set my hand this 25th day of February,A.D. 1897.

- HERMANN G.DIT'1BENNER. In presence of- RICHARD PAUL,

A. F. HOLMES. 

